The ORM Foundation

 Fact types having a UC covering only one of two roles are the most common type, and have always been allowed since NIAM. That doesn't mean that your university answer was correct, of course! But I think that objectified versions of such fact types are rather strange and unusual. Can you remember what the example was? I haven't com ...

Hi Dr, Clifford, Thank you for responding to this post. The subject has always been a burning question with me. As an intuitionist, I don't always get it right, but there seemed good grounds for there to be Value Types in Fact Types with TotalInternalUniquenessConstraints. So I can support this one without trying. As a funny story, at ...

 Hi Clifford, Yes, you caught a poor choice of terms, on my part - an objectification of "supervises" would be something like instances of supervision (not something worth tracking; and not a subtype of Employee).  I'm glad you caught that, and also that you provided a more reasonable example for using Ring and Subtype ...

Regarding Vicor's original question, some NIAM users originally placed restrictions on use of value types, but I never adopted those restrictions. In ORM 2, a value type may appear wherever an entity type may appear. A simple example from my book is: State(.code) calls BeerServe(flOz:) by CommonName(). Here the UC spans roles 1 and ...

The attachment shows how I model the Manager-Employee relationship. I couldn't add it by editing my previous response. The CQL for this is as follows (note the unverbalised external mandatory-exclusion constraint): vocabulary EmployeeManagerCEO; /*  * Value Types  */ PersonName is defined as VariableLengthText(); /*  * Entity ...

Curious! I just checked all the permissions and all seems to be OK. Please click the "more options" button which you should see at the bottom of the topic list in a forum and tell me what you see.    Just to make sure: you must first click on the "reply" button and then you should see the upload ...

Well, I tried, but the Options pane doesn't contain the upload buttons in this forum as it does in others. Do you need to enable this feature for each forum, Ken? 

Ahh, thanks Ken, I looked for a place I could upload a nORMa file, but didn't find it. I'll do that now. 

Hi Clifford, Thanks for your contribution. As a suggestion, if you added a diagram to your post, this would help people who don't understand ORM as well as you do to more easily understand your point. You can add a diagram by firstly creating a .png file and then uploading it using the "Add/Update" button on the reply options ...

vocabulary OilSupply; /*  * Value Types  */ Cost is defined as Money(); Month is defined as VariableLengthText(3); Product is defined as VariableLengthText(80); Quantity is defined as UnsignedInteger(32); RefineryName is defined as VariableLengthText(80); Region is defined as VariableLengthText(80); Season is defined as ...